反应详情

A mixture of 1,2-diphenyl-4-(4-methylphenyl)-3,5-pyrazolidinedione (1.10 g; 3.2 =mol), 35% H2O2 (0.47 ml; 5.5 mmol), and acetic acid (40 ml) was stirred 16 days at room temperature. Sodium metabisulfite (1.0 g) was added and excess acetic acid evaporated off. The residue was dissolved in hot ethyl acetate (25 ml) and benzene (25 ml) and filtered. After cooling to room temperature, the mixture was filtered and the residue recrystallized from 50% aqueous ethanol (20 ml) to give 0.58 g (53%).

1. customexcess acetic acid evaporated off
2. dissolutionThe residue was dissolved in hot ethyl acetate (25 ml)
3. filtrationbenzene (25 ml) and filtered
4. temperatureAfter cooling to room temperature
5. filtrationthe mixture was filtered
6. customthe residue recrystallized from 50% aqueous ethanol (20 ml)
7. customto give 0.58 g (53%)